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A little tid bit that might help. Go to msconfig/Start Up and see if their is a program running in start up causing this problem.

Thank you. I had a look and I disabled Lenovo Screensaver with high hopes that that was it, but sadly no it is still going onto black screen while I am watching slideshow or video or even read something online. There were many programs that come up under start up but I have no idea what most of them are doing so I did not dare to disable any of them in case I case something else not to work properly

OK, you can use the snipping tool to capture these screens, I suggested a cam for your BIOS because you can't snip them.
Try disabling all startup items EXCEPT McAfee, reboot, and see if that helps. If so, re-enable things one at a time until the issues reappears, then you've isolated the problem...maybe.
You don;t really need QuickTime, Facebook, iTunes, Google Toolbar, and such to be in start-up, you can always start them when you need them. With so many thing starting it really has a negative impact on your system's performance. I suppose much of that came from Lenovo as bloatware, they are good at that.
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I have 3 check marks in Start Up. I would bet a dollar against a dough nut hole that one of those things in Start Up is causing your problem. MSE, Bluetooth mouse and keyboard. Everything else starts when I click on them.

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One semantic point. I believe you were not...

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